250 DB. JTJLTUS SCHAARBCHMIDT ON AFGHANISTAN ALGE. 



description of the chlorophyll-granules, cfr. Schaarschmidt's " Ke- 

 searches on the Division of the Chlorophyll-granules, and upon 

 the Occurrence of Hypochlorin in the Cyanophycese and Bacilla- 

 riaceaV' Nature, xxvi. 1882, No. 672, pp. 476-477. 



DESCRIPTION OF PLATE V. 



Fig. 1. Microcoleus Aitchisonii, n. sp. X 1500. 



2. Anabmna (Cylindrospermum), filament, cells in division. X 1000. 

 3 & 4. Conferva-like filaments. X 1000. 



5. Filament, with swelled yellowish cell-wall. X 1000. 



6. Thicker-coated filaments, x 1000. 



7. The cells at the end of the filament (of a) separating, x 1000. 



8. The separated cells remaining close together and forming a Synecho- 



coccus-like family. X 1000. 



9. CAroococcws-like cells, which are derived from the filaments, fig. 6. 



X 1000. 



10. Glceotkece-like cells, springing from the former (fig. 9) cells by divi- 



sion, x 1000. 



11. Stauroneis acuta, Ehrenberg, n. f. tenuis, x 400. 



12. 8. anceps, Ehrenberg, n. f. tenuicollis. X 870. 



13. Mougeotia sp. ? Cells in conjugation, soaked for a few minutes in 



warm water. The cell- walls of the conjugated or cells ready for 

 conjugation swollen so as to fill out the inner cavity of the cells. 

 X600. 



14. The vegetative cells remain unaltered. X 600. 



15-16. The cells after treatment with warm water stained with iodine (in 

 alcohol) ; the cell-wall is, aB seen, composed of layers. Two of 

 the layers (the outer and the inner) are thicker (fig. 15 a, b ; 

 fig. 16 *, c). The cuticula (fig. 16 a) is the common coat of the 

 cells. X 600. 



17. Matured zygospore. X 600. 



18. Euastrum spinulosum, Delponte, *i?iermi$, Nordstedt, n. x&r.Oliveri. 



X600. 



19. Cosmarium Botrytis (Bory), Meneghini, n. var. afghanicum. X 600. 



20. Aitchisonii, n. sp. X 760. 



21. Hookeri, n. sp. X 760. 



22. Oliveri, n. sp. X600. 



23. undulatum, Corda, n. var. omatum. X 760. 



24. abruptum, Lundell, n. f. simplex. x 1000. 



25. Desmidium quadratum (Delponte), n. var. excavatum. End view, 



X 600. 



26. (Edogonium longicolle, Nordstedt, var. scnegalense, Nordstedt, n. f. 



afghanicum. X 870. 



